2. cut two rafters with a circular saw to the pitch of the addition roof and nail them across the rafters on the old roof; they form an upside down v, with the point at the top of the addition roof.. A shed roof over a full-height addition may tie into a gable roof by resting the upper end of the shed rafters against the gable roof's ridge. if the ridge is structural -- that is, if it's. Work from the height of the outside of the new shed roof. a shed roof should slope at least 1 inch per foot, but 2 or 3 inches will be better. if the outside edge is 8 feet high and the area being covered is 15 feet, attach the shed roof addition at least 9 feet 3 inches above the level of the porch or other area being roofed or 10 feet 6.
Put siding on the ends or leave open for easy access. roof the lean-to by nailing plywood or metal over the rafter boards from the shed wall to the outer beam. nail metal flashing under the shed siding and down the lean-to roof. finish a wood roof by laying down roofing paper and nailing on shingles.. 5 things that are hot on pinterest this week. gable roof addition tie in tying. mary love * exterior, laundry, garage. see more "how to build shed roof addition pool cabana shed plans,simple shed truss design 10 x 12 pole shed,steel shed design software online how much wood would i need to build a shed.". Shed roof. this is the simplest solution�a single slope that's attached to the original house at the high point and slants down to the outer wall of the addition. it's easy for the contractor to build and easy on the homeowner's budget, says schultz, but it makes the new space look like an obvious add-on..